Responded to no heat. Found code 13 for system lockout running heat pump. Customer stated it ran blower it high speed yesterday. Reset system. Ran syatem test found 1.2 static. Found 20251 filter to have drywall substance on it causing restriction. Replaced filter and cycled system. Blower audibly running less rpm. 6 min high med low test. Furnace cycled through testing properly with .22 static when replaced with a new filter. Sh3a. No further concerns